Green triphenylmethane dye.



stuff component andoxidizing the leuco earner; mansnfinrnn, or ELBERFELD, AND

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UUNITED STATES PATENT ,QFF QE- CARL nnrnnnnnrorri or L ERKU EN.

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GREEN, TRIPHENYLZMETHANE DYE.

1 To all whom it may concern Be it known that we, ARTHUR HAUsntiRFEn and CARL HEIDENREICH, doctors of philosaophy, chemists, citizens of the German Empire, residing, respectively, at Elberfeld and Leverkusen, near Cologne, Germany, have invented new and useful Improvements in have described generally dyestuffs obtainable by reacting with the diazo compounds of the triphenylmethane leuco compounds derived from an aminobenzaldehycle and an aromatic oxycarboxylic acid upon an azo dyecompounds. In the present application we wish to specifically describe and claim the "product made from 2.6-dich1oro-5-aminobenzaldehyde, ortho-cresotinic acid and 1- -phenyl-3-methyl-5-pyrazolone having most probably the formula:

cas coon co0H on oinre=csn =0 on OH: NH/ co 3 01 In order to illustrate the new process more fully the following example given, the

.parts being by .aveight :-72 parts of the leuco compound obtained from 1 molecule of 2.6-d1chloro5-annnobenzaldehyde and 2 molecules of ortho-cresotinic acid are dissolved in 300 parts of concentrated sulfuric acid and are then diazotized by means of a solution of 10.5 parts of sodium nitrite'in Specification of Letters Patent.

Application filed August 22, 1911. Serial No. 645,432.-

Patented Mar. 26, 1912'.

cipitate is ,filtered ofl',,washed, with water and then with a 1 per cent. sulfuric acid. The dlazo compound is stirred up with 600 parts of ice water and added to a solution of 27.5 parts of l-phenyl-3-methyl-5 pyrazolone in 30 parts of hydrochloric acidof 19 B. and 100 parts of water. 80 parts of a 33 per cent. caustic soda lye is added to the cold solution. IV hen the copulation is complete the mixture is heated to C., the dye is precipitated with sulfuric acid, filtered ofi', washed and dried.

The new dye is a red powder scarcely soluble in water and soluble in dilute alkalis witha yellowish-brown coloration. It dyes wool from acid baths brown shades which on being treated with bichromate change into a green fast to falling, potting and light.

We claim The herein described new dyestufi' having' most probably the formula:

which dyestull' is in the shape of the free carboxylic acid after being dried and pulverized a red powder scarcely soluble in water and soluble in dilute alkalis with a yellowish-brown coloration; dyeing wool from acid baths brown shades which on being treated with bichromate change into a greenfast to fulling, potting and light, substantially as described. I

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

ARTHUR nAUsDonrER. [L- 8;

CARL I-IEIDENREICI-I. a] Witnesses L. NU'rnR,

ALBERT RNUFER.

Gorrectio n in Letters Patent No.-1,021, 36 4.

It ishereby certified that in Letters Patent Nd. 092,364, granted. March 26,

'reich, ofLeverkusen, near-Cologne, Germany, for an improvement in Green Trihen lmethane D e an error'an earsin the rinted s ecificatio-n re u'irinw correcsame may cdnform to the recbrd'of the case in the Patent ()fliee. Signed and sealed this 11th day of June, A. L.1)., 1912.

[SEAL] 0. 0. BiLLINGS,

Acting Commissioner of Patents.

1912, upon the zipplicationof Arthur Hausdfiirfer, 01' Elberfeid, and Carl Heideni C-OOH COOH tion as followszLines 69-71, formula, for group OH read- OH and CH CH that the said Letters Patent shonld he read with this correction therein that the 

